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Applied Spectroscopy

Applied Spectroscopy


  • Vol. 68, Iss. 1 — Jan. 1, 2014
  • pp: 1–4

Mid-Infrared Diffuse Reflection on Ultrafast Time Scales

Eric B. Brauns

Applied Spectroscopy, Vol. 68, Issue 1, pp. 1-4 (2014)

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This paper describes an instrument capable of studying diffuse reflection of mid-infrared (mid-IR) photons on ultrafast time scales. Femtosecond mid-IR pulses are generated by difference frequency mixing the output of an optical parametric amplifier that is pumped using a regeneratively amplified Ti:Sapphire laser. Time resolution is achieved by up-converting the diffusely reflected photons with pulses from the Ti:Sapphire oscillator. Experiments were performed on a series of powdered KBr samples containing varying amounts of carbon black. The results suggest that diffusely reflected mid-IR photons fall into two distinct categories. A small fraction of the photons travel relatively long effective path lengths (1.3-2.3 mm), while the majority traverse a much shorter distance (0.2-0.05 mm).

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Vol. 9, Iss. 3 Virtual Journal for Biomedical Optics

Eric B. Brauns, "Mid-Infrared Diffuse Reflection on Ultrafast Time Scales," Appl. Spectrosc. 68, 1-4 (2014)

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